A corpoba



R. SUCZEK.

FLUID COMPHESSING APPARATUS. APPLlcATloN FILED JAN.2|. 191s.

Patented Aug. 23, 1921.r

3 SHEETS-SHEET I.

INVENT? A MMA R. SUCZEK. FLUID COMPRESSING APPARATUS.

APPLICATION man 1AN.2\, 191s.

Patented Aug. 23, 1921.

3 SHEETS-SHEET 2.

R. SUCZEK.

FLUID GOMPRESSING APPARATUS.

APPLICATION FILED 1AN.21, 1918.

1,388,670. mmm. 23,1921.

3 SHEETS-SHEET 3.

Y JNVENToR. Q1 5 D N N BY g* e f1 ATTORNEY.

UNITED STATES PATENT ferries.

ROBERT suc'zrix, yor PHILADELPHIA,PENNSYLVANIA, Assieivoia To c. H. WHEELER MANUFACTURINey COMPANY, or PHILADELPHrA, rEiiiisrLvANrA, A cons-ORA- TION oFrnNNsYLvANIA Specification of Letters latent.

FLUID-comrnnssiive APPARATUS.

PateiitedAug. 23, 192i.

Application led January 21, 1918. Serial No. 212,936.

T 0 all whom t may concern.'

Be it known that I, ROBERT SUozEn, subject of the 'Emperor of Austria,.residing in Philadelphia, in the county of Philadelphia and the State of Pennsylvania, have invented` new and useful Improvements in Fluid-,Compressing Apparatus, of which the following is a specification'.

My invention rrelatesl Vto apparatus for compressing elastic fluid and involves the ejector principle in accordance with which an elastic motive fluid, such as steam, is expanded, effecting jet formation. which entrains the elastic fluid to be compressed, the Y mixture of motive and entrained4 fluids then traversing a passage'cinwhich velocity is converted into pressure.v 1

In accorda-nce with my invention, disadvantages (inter alia friction losses between 4stages Vand rise of temperature of mixture discharged from an earlier into a later stage) of two or more stage ejector apparatus are overcome by associating, as in a single stage ejector, a plurality of nozzle 25 structures coi-acting with a common diffuser structure or combining tube structure.

In accordance with my invention, one of the nozzle lstructures projects well into the diffuser structure, while another -of the nozzle structures terminates short of the entrance to the diffuser structure, or terminates substantially at the entrance to the diffuser structure, or projects somewhat into the diffuserv structure but to less distance than the first mentioned nozzle structure.

Further in accordance with my invention,

there is formed between theinterior of the Vcombining tube or diffuser structure and' the longer nozzle structure which projects Awell thereinto a preferably converging passage whose smallest cross sectional area. is greater than the total outlet area of the other or shorter nozzle structure and smaller than the total outlet area ofthe longer nozzle structure, and smaller than the cross sectional varea of the throat of the diffuser structure, the cross sectional'area of said throat of the diffuser structure preferably being. less than the total outlet area of the i zle structure is greater than consumed by the shorter nozzle structure, and preferably the ture.

relation is'sucli that the motive iiuid consumed by the shorter nozzle structure is less than 25 per cent. of the total motive fluid consumed by both the lo-ng and short nozzles, and in accordance with my invention, this relation may be obtained by making the total throat area of the shorter nozzle structure less than 25 per cent. of the tota-l throat area of both long and short nozzle structures, or, differently stated, the total throat area of the short nozzle structure is onethird or less of the total throat area of the long nozzle structure.

Further in accordance with my invention, the mixtureof entrained fluid with the mo- Fig. 2 is a plan view of the nozzle supporting plate of Fig. l.

Fig. 3 is a longitudinal sectional view, on enlarged scale, of a portion of the main or longer nozzle structure of Fig. 1.

Fig. L lis a top 'plan' view of the nozzle structure shown in Fig. 3.

Fig. 5 is a bottom plan View ofthe nozzle structure shown in Fig. 3.

Fig. 6 is aside elevational view of the core structure of Fig. 3. l

Fig. 71s a longitudinal sectional view, partly inelevation, of a modified core struc- Fig. 8 isa bottom ture shown in Fig. 7.

Fig. 9 is a longitudinal` sectional view of a modified form of ejector embodying my invention. Y

Figs. l0 and 1l are fragmentary longitudinal' sectional views of modified forms of eject-or apparatus embodying my invention. Fig. 11a is a plan view illustrating. the relative positions of the long and short -nozzle structures of Fig. '11 at their upper ends.

plan` view of the struc- Fig. 12 is a fragmentary longitudinal sectional view of a further modification embodying my invention.

It will Vbe understood that the main or longer nozzle structure may consist of one or a plurality of nozzles formed Within a unita-ry structure, or may consist of a plurality of structurally independent nozzles; and it will be understood that the auxiliary or shorter nozzle structure consists of a plurality of nozzles, which may be considered a group, and within such group the nozzles may be of the same or different lengths.

My ejector apparatus may be utilizedin various relations, and is utilizable to advantage for producing high vacuum, as of the order of 2814 to 29g inches of mercury (Hg). Such vacuum may be produced and maintained in condensers 'such as those condensing theexhaust steam from turbines or steam engines, and the air so exhausted may be raised in pressure or compressed to substantially atmospheric pressure, or to other suitable pressure. Y

Referring to F ig. l, the air or other elastic fluid to be compressed is delivered by any suitable conduit, not. shown, to the port l of the suction chamber l5. rl`he elastic motive iuid under pressure, as steam, is delivered through theport 2 into the steam chamber. 3, which is separated from the suction chamber by the nozzle plate lllcarrying the long and short nozzle structures 16 and il, both nozzle structures being of the expansion nozzle type, that is, divergent beyond their throats, to e'dect expansion oi the motive duid and thereby convert its pressure into velocity, whereby there will issue 'from their outlets motive fluid jets consisting ol motive fluid traveling at high velocity. rl'he short nozzle structure comprises the circular series of nozzles Ll, disposed, as indicated in Fig. 2, around the central nozzle structure 16 whose throat is l2. The short nozzles et are shown as threaded into the plate 14, while the nozzle structure lG is integral therewith, though it will be understood also that the long nozzle structure may e separate 'from the plate lil and threaded thereto.

ln this example the short nozzle structure terminates short of the entrance to the conimon diffuser structure or combiningtube structure 25 comprisingthe sections 22, 8 and l0, the structure beingconvergent-divergent, having the discharge outlet at ll, and in this example having the throat or regions of smallest cross section of some length as indicated at 9, though it will be understood that the elongated throat 9 may beomitted and the adjacent ends of the seetions 8 and l0 may immediately adjoin, as well understood inthe art and as indicated in later figures hereof. On the other hand, the main or long nozzle structure projects well or far into the diifuser structure, and

4the jets beine' there is termed between the exterior of the nozzle structure l@ and the interior ot the diiluser structure a convergent passage Y whose throat orregion oi smallest cross section is indicated at 43.

The long or main nozzle structure i6 may be a common or ordinary expansion nozzle, such as used in this art, and in such case will have a conical` or divergent portion below the threat l2'with its outlet at-,the lower end at-23, both the throat and the outlet being generally ol circular cross section.

ln order, however, to increase the lateral entraining surface oit the jet of motive fluid :issuing from the nozzle structure, a core 5 may be disposed within the conicalV divergent portion oi the nozzle structure below the throat 1.2, such core structure being indicated in Fig. 6 as having thepassages, channels, or grooves 13, of rectangular, triangular or other suitable Across section, terminating at their upper ends in the imite edges Qd which, as indicated in Figs. l and 3, are tlegmsited below the throat l2, whereby the throat l2 is common to all the passages lf3; the passages i3 are closed longitudinally by the outer conical shell i6 of the nozzle structure, whereby a circular series or" jets issues troni the nozzle structure, the total area of D thus greater than the area of a single ict, and so affording greater lateral surface for entrai-ning the elastic 'fluid to be compressed.

ln Figs. T andS the nozzle core is oi" modistrueture in that through the center oi the core lS extends an expansion nozzle passage 25 having` its smallest cross sectional area at l) and its outlet at 17'. Upon the core 1S are the longitudinally extending ribs core members 2O between which are the L fi-ores, channels or passages 2l, in this stance ot triangular cross section. lllhile the ce tral nozzle-passage is shown as oi greater length than the passages 2l, it will be understood that they may be ot substantially equal length. This core structure erted in a nozzle member, similail lv and El, in which case the nozzle passage Q5 `will terminate eren l'arther within the diiluser structure than thecore structure l@ ot Fig. l. By so employing the extra length nozzle passage, as i5, the ratio ot compression ot the entire ejector apparatus will be somewhat increased, that is, the quotient ot the absolute pressure at 'the discharge or the ejector divided by the absolute pressure in thesuction chamber l5 will be a greater quantity. Such an arrangement is particularly suitable when the ejector is w rlring against a higher back pressure.

Referring to Fig. 9, av generally similar structure is shown comprising the suction chamber having'the suction inlet or port 27. Elastic motive fluid, as steam, is introj which are threaded the long and short nozzle structures. rl he short nozzle structure comprises the ,circular series of short expansion nozzles 31, whichl in this case are inclined inwardly toward the axis of the diffuser structure or combining tube structure 32; and they also extend to or into the convergent section 33 of the diffuser 32, which comprises said convergentsection '33 and the dilvengiiig section 34 meeting at the throat 9a, Y the discharge end ofthe diffuser being at the lower end of the section 34. The long nozzle Structure is in general similar to the nozzle structure 16 of Fig. 1, and comprises the member 36 projecting well or far into the diffuser section 33, and having the core 38 having the outwardly extending ribs 40, between which and the shellv 36 are formed channels or nozzle passages 41. In this instance, however,A eachk nozzle passage 41 has its own separate throat 37 whose upper end is atV 39. The' sliell'or nozzle body 36 may, as indicated at 42, be reduced 'in diameter suitably to determine the cross sectional area of the passage 43, corresponding with passage 43 of Fig. 1. Between the exterior of the nozzle structure 36 and the interior of theA diffuser section 33 is .formed a convergingr passage whose Vregion of smallest cross sectional area is at 43.

Referring to Fig. 10," the arrangement is again in general similar to Fig. 1. The diffuser structure orcombining tube structure 25 comprises the converging section 8 Vand `rdiverging section 10 meeting at the throat 9,7the section 3 having a converging passage 7 betweenv its inner wall and the outer wallof thernozzle structure 16 having the divergent nozzle passages 13 Y each having, if desired, its own throat 37 Y ldifferent lengths, the shortest nozzles 4 ter# as in Fig. 9.vr lnvthis case the short nozzle structure comprises a group of nozzles of minating short'o'f the entrance to the diffuser structure, while the long nozzles 31 of the group extend into the diffuser structure, and still further nozzles, as 44, terminating at the entrance to the diffuser structure. The purpose of this illustration is to indicate that the short nozzle structure may comprise nozzles of different lengths. As indicatedfurther, `some'of the nozzles, as 31,

may be inclined, while the others may have their axes parallel to the axis of the diffuser structure 25. l

tureQ and having their throats at 46. The

passage 47 from the entrance to the conv rging section 8 to the lower ends of the nozzlesV 45 is convergent, and the smallest cross sectional area of such passage is adjacent the lower ends of the nozzles 45, such region of smallest cross section corresponding with the passages 43 of Figs. 1, 9 and 10.

The short nozzle structure comprises short inclined nozzles 43 having their throats at 49 and projecting into the diffuser structure. l

.fis indicated in Fig. 11, the nozzles 45 are arranged in a circular series, as are also the nozzles 43. Y

Referring to Fig 12, the long nozzle structure has a core structure of the character indicated in Fig. 7, whereby the nozzle passage 17 has its ein` illustration being to indicate that the short ynozzle structure may have nozzles of any suitable length falling short of or extending into the difiuser structure.

The mode of the operation ofthe struc-V tures shown in Figs. 1, 9, 10, 11 and 12 is as follows:

The air or other elastic motive fluid to be raised in pressure enters the suction chambersl or 26 and comes into contact with the Y jets of motive fluid, as steam jets, issuing,` from short nozzle structure, the mixture then passing into the convergent passage 7 or 35, and in traversing the same undergoes compression or rises in pressure, or increases in velocity, and after traversingthe narrow passage or throat 43 is acted upon by the steam or other motive {iuid jet or jets issuing from the long nozzle structure, with the result that the mixture undergoes further compression in the diffuser structure, from which it is discharged, at the lower end of the diffuser structure, at the desired higher pressure.

For example, the pressure of the or Vother elastic fluid entering the suction cham- Vmay have attained a higher pressure, but

less than eight inches of mercury absolute.

'Beyond the passage or throat 43 the pressure is still further increased to the desired or suitable pressure existing at the discharge end of the diffuser structure, such final pressure being for example, atmospheric pressure.

lt is preferred as to all the arrangements described and illustrated that the cross sectional area of the passage or throat 43 shall be larger than the suni of the areas at the outlets of the nozzles of the short nozzle structure; and that the cross sectional area of the throat or passage 4:3 shall he smaller than the total outlet area of the long nozzle structure. That is, for example, the cross sectional area of the passage or throatI 4l?) is preferably made larger than the sum of the areas of the passages of the nozzles Ll, Fig. 1, at their lou-fer or discharge ends; and the cross sectional area of the passage or throat i3 is preferably smaller than the sinn of the areas of the nozzle passages 13, l, at their lower or discharge ends.

.lt is also preferred as to all the structures described and illustrated that the total area at the outlet or outlets of the long` nozzle structure shall he `@greater than the cross scctional areal of the diffuser or coinhining' tube throat 9, `figs. l, 10, il and l2, or 9 Fig. 9.

A nd it is further preferred as to all the structures illustrated and described that the cross sectional area of the dillfuser throat .l or 9L shall he greater than the cross sectional area of the passage or throat 43.

lt is also preferred as all structures described and illustrated that the total of the throat areas of the short nozzle structure shall loe less than 25 per cent. of the total of the throat areas of the long; and short nozzle structures conihined. That is to say, the total throat area of the long nozzle structure may he three or incre tiines the total of the throat areas of the short nozzle structure, Wherehy the total niotire fluid employed in the long` nozzle structure will he three orniore times the total niotive fiui consunied in the short nozzle structure.

ln the long nozzle structures the expansion of the niotire fluidtherein may eilcct a decrease in temperature of the motive fluid as it approaches the discharge or outlet end of the nozzle structure, with the result that the long` nozzle structure may partake of a temperature louer than the nurture ofentrained fluir with the nioi fluid discharged frein the short nozzle structure; and since this mixture passes in contact with the longnozzle structure before reaching the discharge end of the long nozzle structure or passage d8, the long nozzle structure will effect an absorption of heat from that ininture, -With the result that the motive fluid in treversing;l the long` nozzle structure,

lotherwise tending` to hecorne insist, may heconie dry and saturated before leavingthe long nozzle structure, with a consequent gain in economy. @n the other hand, the nii);- ture of entrained fluid with the inotiire fluid discharged from the short nozzle structure in passing from the entrance of the diffuser structure to the passage or throat is cooled, with the result that its vohune Will he diminished and the entraining action of the motive fluid issuing frein the nozzle structure will he improved or increased.

lflfhilo l have herein discl sed means within the ejector structure, particularly Within the diffuser or combining tube structure, for cooling` a mixture of motive and entrained fluids, the saine is not herein claimed, hut is claimed in :my cri-pending application Serial No. 469,154, filed lllay i3, 1921. Y

ln the appended elainis, diffuser or diffuser structure is referred to or employed the equivalent of or synonymous with combining tube or combining tuhe structure. ind the terms long77 and short as applied in the appended claims to the nozzle structures refer to the fact that the discharge outlet or outlets of the one nozzle structure is or are disposed nearer the throat 9 or 9 of the conirnon diffuser structure or confiloininte,` tuhe structure than the outlet or outlets of the other nozzle structure.

lllhat l claim is:

l. in ejector comprising` central nozzle structure, and group of nozzles surroundingI said nozzle structure, the total throat arca of said central nozzle structure being greater than the total throat area of said group of nozzles.

v 2. An ejector comprising diffuser struc- ;ture, short nozzle structure, and long nozzle structure dischar ing motive fluid nearer the tl'iroat of said diffuser structure than said short nozzle structure, the total throat area of said longI nozzle structure being greater than the total throat area of said short nozzle structure.

du ejector comprising,` diffuser structure, short nozzle structure, and longnozzle structure extendingintoV said diffuser structure and discharging; nearer the throat there- 'han said short nozzle structure, the total teroat area of said short nozzle structure heine' less than the total throat area of said long nozzle structure.

il. fin Vejector comprising' diffuser structure, short nozzle structure comprising a group of nozzles, and long nozzle structure projecting into said diffuser structure and discharging nearer the throat thereof than said nozzles of said short nozzle structure, the total throat areaof said long nozzle structure beinggreater than the total throat area of the nozzles of said short nozzle structure.

5. lin ejector comprising diffuser structure, long; nozzle structure projecting Well into said diffuser structure, and short nozzle structure projecting, into said diffuser structure, the total throat area of said short nozzle structure being` ess than the total throat area of said long` nozzle structure.

6. An ejector comprising diffuser strueture, long nozzle structure projectingv Well into said diffuser structure, and short nozzle structure comprisinga plurality-of nozzles into said diffuser structure and comprising a plurality of'motive fluid conducting passages, and short nozzle structure comprising' a plurality of nozzles discharging into said diluser structure, the total throat area or said short nozzle structurerheing less thany the total throat area ofusald longnozzle structure; n A

S. An ejectorpcomprising central' nozzle structurmand a group of' nozzles surrounding said nozzle structure, the total throat area of' said central nozzle structure being at least three times as great as the total VthroatI area'ofsaidrgroup of nozzles.

9. in ejector comprising diffuser structure, long nozzle Vstructure projecting well into said diffuserstructure, and'short nozzle structure, the total throat area of said long nozzle structure being at least three times as great as the total area ofsaid short nozzle structure. j l Y i0. An ejector comprising diffuser structure, long nozzle structure projecting Well into said diffuserstructure, and'short nozzle structure comprising. plurality of nozzles, the total throat area of said'long nozzle structure beingat least three times as greatas the total area of' said short nozzle structure. Y

11. A n ejector comprising diffuser structure, lon@` nozzle structure projecting into said-diffuser and comprising` a plurality of mot-ive fluid conducting passages, and short nozzle structure comprising a pluialitj7 of nozzles discharging into said diffuser structure, the total throat area of said long nozzle structureheing at least three times as great as the total throat areavof said shortnozzle structure.

l2. Ejector-apparatus comprising diuser structure, long nozzle structure projecting into said diffuser structure andy spaced therefrom to form a passage Whose smallest cross sectional area is not greaterthan the total outlet area of said long' nozzle structure, and short nozzle structure discharging through saidpassage. v Y

13. Ejector apparatus comprising diuser structure, long nozzle structure projecting into said diuser structure and spaced therefrom to form a passage whose smallest cross sectional area is less than the totaloutlet area of said long nozzle structure, and short nozzle structure discharging through said passage. Y'

Ejector apparatus comprising diffuser structure, long` nozzle structure projecting into said diffuser structure and spaced therefrom to form a passage whose smallest cross sectional'area is not greater than the total outlet area of said long nozzle structure, and short nozzle structure extending i o said diffuser structure and discharging lirough said passage. Y

15. -jector apparatus comprising diffuser structure, long nozzle structure projecting into said diffuser structure and spaced therefrom to form a passage Whose smallest cross sectional area is less than the total outlet area of said long nozzle structure, and shortV nozzle structure discharging through said passage, said diffuser structure decreasing in cross section from its entrance to said passage.

16. Ejector apparatus comprising diffuser structure, long Vnozzle structure projecting into said diffuser structure and spaced therefrom to form a passage Whose smallest cross sectional area is not greater than the total.

outlet area of said long nozzle structure, and short nozzle structure extendmg into said diffuser structure and discharging through said passage, said diffuser structure decreasing in cross section from its entrance to said passage.

17. An ejector comprising diffuser structure, long nozzle structure projecting into said diffuser structure and spaced therefrom to form a passage decreasing in cross section from the entrance of said diffuser structure and whose smallest cross sectional area is not greater than the total outlet area of said long nozzle structure, and short nozzle structure projecting into said diffuser andV discharging into said passage, the total throat area of said short nozzle structure being less than the total throat larea of said long nozzle structure.

18. An ejector comprising diffuser structure, long nozzle structure project-ing into said diffuser structure and spaced therefrom to form apassage decreasing in cross section from the entrance of' said diffuser structure, long nozzle structure projecting into said diffuser structure and spaced therefrom to form a passage Vdecreasing in cross section from the Ventrance of said diffuser'structure and Whose smallest cross sectional area is not greater than the total outlet area of said longnozzle structure, and short nozzle structure projecting into said diffuser and discharging into saldy passage, the total throat area of said long nozzle structure being at least three tiines as great as the total throat area of said short nozzle structure.

20. An ejectorl comprising diffuser structure having a throat, long nozzle structure delivering into said diffuser and having a total outlet area greater than the cross sectional area of said ydiffuser structure at its said throat, and co-acting short nozzle structure delivering into said diffuser struc-- ture,

2l. in ejector comprising diffuser structure having a throat, long nozzle structure projecting into said diffuser Vand having a total outlet area greater thanV the cross sectional area of said diffuser structure at its said throat, and co-actingshort nozzle strucv ture delivering into said diffuser structure.

22. An ejector comprising diffuser structure having a throat, long nozzle structure delivering into said diffuser and having a total outlet area greater than. the cross sectional area of said diffuser structure at its v said throat, and co-acting short nozzle structure delivering into said diffuser structure, the total throat area of said short nozzle structure being less than the total throat area of said long nozzle structure.

An ejector' comprising diffuser' structure having a throat, long nozzle structure projectinginto said diffuser'and having a total outlet area greater' than the cross sec tional area of said diffuser structure at its said throat, and co-acting short nozzle structure delivering` into said diffuser structure, the total throat area of said short nozzle structure being less than the total throat area of' said long nozzle structure.

2a. An ejector comprising diffuser structure having a throat,long nozzle structure projecting into said diffuser and having a total outlet area greater than the cross sectional area or" said diffuser structure at its said throat, and kco-acting short nozzle structure delivering into saiddilfuser structure, said long nozzle structure forming with said diffuser Vstructure a coni-'erging passage Whose least cross sectional area is less than the total outlet area of said long nozzle structure.

in ejector comprising diffuser structure having a throat, long nozzle structure projecting into said diffuser' and having a total outlet area greater ,than the cross sectional area of said diffuser structure at its said throat, and coacting short nozzle structure delivering into said diffuser structure, the total throat area of said short nozzle structure being less than the total throat area of said long nozzle structure, said long nozzle structure forming with said diffuser structure a converging passage Whose leastcross sectional area is less than the total outlet area of said long nozzle structure.

26. Anrejector comprising diffuser structure having a throat, long nozzle structure 1ra-:sacro projecting into said diffuser and having a total outlet area greater than the cross sectional area of said diffuser structure at its said throat, and co-acting short nozzle structure projecting into said diffuser structure.

2. An ejector comprising diffuser structure having a throat, long nozzle structure projecting into said diffuser and having a total outlet area greater than the cross sectional area of said diffuser structure at its said throat, and co-acting short nozzle strncture projecting into said diffuser structure, the total throat area of said short nozzle structure being less than the tot-al throat area of' said long nozzle structure.

28. in ejector comprising diifuser structure having a throat, long nozzle structure projecting into said diffuser and having a total outlet area greater than the cross sectional area of said diffuser structure at its said throat, and co-acting short nozzle structure projecting into said diuser structure, the total throat area of said short nozzle structure being less than the total throat area of said long nozzle structure, said long nozzle structure forming With said diffuser structure a converging passage Whose least cross section is less than the totaloutlet area of said long nozzle structure.

29. An ejector comprising diffuser structure, long nozzle structure projecting into said diffuser structure, short nozzle structure comprising a plurality of nozzles delivering into said diffuser structure, the total of the outlet areas ofl said nozzles of said short nozzle structure being smaller than the smallest cross sectional area of the passae'e between said long nozzle structure and said diffuser' structure.

30. An ejector comprising diffuser structure, long nozzle structure comprising a plurality of nozzle passages projecting into said diffuser structure, short nozzle structure comprising a plurality of nozzles delivering into said diffuser structure, the total of the Voutlet areas of said nozzles of said short nozzle structure being snialler than the smallest cross sectional area ofthe passage between said long nozzle structure and said diffuser' structure.

8l. An ejector comprising diffuser structure, long nozzle structure projecting into said diffuser structure, short nozzle structure comprising a plurality of nozzles delivering into said diffuser structure, the total of the outlet areas of said nozzles of said short nozzles structure being sinaller than the smallest cross sectional area of the passage between said long nozzle structure and said diffuser structure, and the total throat area of said short nozzle structure being less than the total throat area of said long nozzle structure.

32. An ejector comprising diffuser structure, long nozzle structure comprising a plucomprising e. plurality et nozzles delivering' outlet rlity otnozzle passages projecting into said at its said throat, (zo-acting short nozzle diffuser structure, short nozzle structure into seid diilnser structure. the total of the areas. et seid nozzles of seid short nozzle structure being smaller than the smallest cross sectional rtree oi' the @lissage between seid long nozzle/structure and seid diffuser structure and 4the total throat eres of seid long nozzle structure being' et least three tirfies as greet es the tctel throat erezio; said short nozzle structure.

' short nozzle structure deliveringv into seid di between said long 33. 'ljectorepperatuscoinprising diffuser f structurej long nozzle structure progecting intoszid diinser structure spliced t ere from forni e passage Whose sinellest cross sectional not greater than the tote? onlet of seid long nozzle structure, enc d." charging throngl seid psssegethe total-outlet eres. ot' seid short nozzley structure being less than sinellest cross sectioned aree ol said passage.

` S. Ejector epperatus comprising diffuser structure.. long nozzle structure comprising e. plurelit7`-v ot nozzle peser-ges projecting intov said diilfuser structurea the total outlet of seid loi-ig; nozzle'struoture being greater than the smallest cross sectioneleree of the passage between seid diiluserstructnre end seid long;v nozzle structure, and short nozzle structure discharging through said passage, the totsll structure being less than seid srnellest cross sectional eres of seid' passage. A

' 35. An ejector comprising diffuser structure hei-(ing a. throat7 long nozzle structure delivering intese-id diffuser structure :ind having total Outlet areegreeter then the cross sectional area ot the diffuser struct at its seid throat, co-aeting short nozzle strncture delivering into seid diiluser structure, the total outlet aree, said short` noz structure being less than 'the Asinellet cross sectional aree; long nozzle structure und ture. l

36. An ejector comprising diffuser structure' having e throat, long nozzle structure comprising oplurelity of nozzle'pesssges projecting into seiddillquser structure end having e total outlet eres greater than the cross sectional aree of the diffuser structure at its seid throat,` coiacting short nozzle tru'cture coniprisinge plurality oi" nozzles ll-"is-er structure. total ofthe outlet areas' or the nozzles of' short nozzle Vstructure being' less than lne smallest cross sectional area oli' the passage seid diffuser strucdiluser structurev Y 37. Anejectorconiprising diuser st ncture' having e throat'7 long nozzle structure delivering intojseid diuser structure sind having a total outleteree greater than the cross sectional area of the dilluser structure outlet eren 'of seid short nozzle of the pssege between seid nozzle structure end seid J structure delivering into seid diffuser structure, the totel outlet eres of seid short nozzle structure being less than the smallest cross sectional eres ot the passage between seid nozzle str ,cture end seid diffuser structure7 end the total throat area or nid short nozzle struct-nre being,` less than the total throat aree of seid long nozzle structure.

38. in ejector con pris'ng diffuser structurea long` nozzle structi re deliveringy into seid diffuser structure, short nozzle strnctu f delivering into seid dilluser structure, th smallest cross sectionil aree oi' the passage hetiveen seid dir iser structure and seid long 39. An ejector comprising di Sal iser strncture, long' nozzle structure delivering` into seid ditluser struetine short nozzle structure delivering` into seid di'liuser structure, the smallest cross sectional eren oi the pas sage between seid dilnser struc-tore and seid long nozzle structure seing less tien the cross sectional eres or said dill user structure et its throat, and the total liront aree ol' seid short nozzle structure l ing Vless then the'total throat eres et seid longl nozzle structi Ye.

l0 ector comprising dillnser structure9 long,` nozzle structure delivering` seidVV dilluser strn'ture, short nozzle structi re delivering` into seid dilluser structure, the sninlles; cross sectional eres oit the pessage bet-Ween seid dh user structure and sei-l loner nozzle structur being` less then the cross sectional eres of seid dirliser structure et its thi-oet and the tote-l outlet eren ot solo long; i

ozzle structure being` greater then the cross sectional eres.. of seit ditiuser structure et its throat.

"l egec-or 'lor elastic fluid comprising dii'- l convergent and dineans roviding a pluinotivellum-expanding i e' Well Within the l ditllnser snucture7 1 ivergentn1o"iveilnid lelirerirg into seid con- `l diiluser structure s et greater dis- Nd ditluser struc- "lets oiE seid iirst cli/live Mei a elle or compressing elastic iotive luid comprising difleving converoent end diineens providing plut niotive-lnid-expending terminating well within the turc, .eind n ser'es o short divergent motivelnid-erpzuidnig nozzles .deliverlng into said into Y convergent portion of said diffuser structure and having discharge outlets at greater distances from the axis of said di'll'user strueture than the discharge outlets of said first named nozzle passages, Vthe amountof motive fluid traversing said first named nozzle passages being more than three times the motive fluid traversing said short nozzles.

d3. in eject-or comprising a plurality of nozzle structures, a tubular diffuser common to them, one of said nozzle structures projecting into said diffuser and spaced therefrom to form a throat, another of said nozzle structures delli ing to said throat, said diffuser having main throatps-.ssing the motiv iuids from said nozzle structures and the entrained fluid, the quantity of motive fluid consumed by said one nozzle structure being substantially three times the amount of motive duid consumed by said other nozzle structure. I

di. in ejector tomgrisin-g a plurality of nozzle structures, a tubular diffuse common to them, one of said nozzle structures projecting into said diffuser and spaced therefrom to form a throat, another of said nozzie structures delivering to said throat, said diffuser havin'` a main throat passing the motive fluids from said nozzle structures and the ent-rained fluid, Vthe area of said first named throat being frreater than the total outletarea of said other nozzle structure.

415. n ejector comprising a plurality of nozzle structures, a tubular diffuser common to them, one of said nozzle structures projecting into said diffuser and spaced therefrom to form throat, another of said nozzie structures delivering to said throat, said diflu er having a main thro-at passing the motive fiuids from said nozzle structures and the entrained fluid, the total area of the outlet of said one nozzle structure being greater than the area of .said first named throat.

ln ejector comprising a plurality of nozzle structures, a tubular diffuser common to them, one of said nozzle structures projecting into said diffuser and spaced thererom to forni tnroat, another of said nozzle structures delivering to said throat, said diffuser having a mainthroat passing the motive fiuids from said nozzle structures and the entrainer. fluid, ""ie area of said second named throat being" greater than the area of aid first named throat.

fin ejector comprising a plurality of Vnozzle structures a tubular diffuser common to them.` one of said nozzle structures projecting into said diffuser and spaced therefrom to form a throat, another of said nozzle structures delivering to said throat, said diffuser having a main throat passing the motive fini ds from said nozzle structures and the entrained fluid, the total area of the outlet of said one nozzle structure being greater than the area of said second named throat.

48. Expansion nozzle structure compris! ing a member having Within it a plurality of passages diverging from each ,other and themselves increasing-in cross sectional area in the direction of flow of fluid'therethrough.

all). Expansion nozzle structure comprising a member having Within it a plurality oi' passages diverging from each other and themselves increasing in cross sectional area in the direction of flow of fluid therethrough, and a central divergent passage.

50, Expansion nozzle structure comprising a member having Within it a plurality of passages diverging from each other and themselves increasing in cross sectional area in the direction of flow of fluid therethrough, and a central divergent passage, said last amed passage terminating beyond the outlets of said first named passages.

5l. Expansion nozzle structure comprisng an envelop member having a divergent sage, and a divergent core member fitting ace a series of passages diverging from each other and themselves divergent.

52. Expansion nozzle structure comprisng an envelop member having a divergent assage, and a divergent core member fiting Within said passage and having upon its surface a series of passages diverging from each other and themselves divergent, said core member having a co-axial divergent passage;

Expansion nozzle structure comprising an envelop member having a divergent passage, and a divergent core member fitting Within said passa-ge and having upon its surface a series of passages diverging 'from each other and themselves divergent, said core member having a central diverging passage having an outlet beyond the outlet of said first named passages.

54e. ljector apparatus for compressing elastic fluid by elastic motive fluid comprising diffuser structure, long and short nozzle structures for expanding motive fluid, the long nozzle structure projecting into said diffuser structure, and the motive fluid discharged by the short nozzle structure edecting preliminary compression Within the diffuser structure of the elastic duid to be compressed before reaching the outlet of the long nozzle structure.

55. Ejector apparatus for compressing elast-ic fluid by elastic motive fluid comprising diffuser structure, long and short nozzle structures for expanding motive fluid, the long nozzle structure projecting into said diffuser structure,the total throat area of the long nozzle structure being greater than the total throat area of the short nozzle structure, andthe motive fluid discharge by the p s thin said passage and having upon its surshort nozzle structure eiecting preliminary.

compression Within the diffuser of the elastic luidto beA compressed before reaching the outlet of the long nozzle structure.

56. Ejector apparatus for' compressing elastic iuid'by elastice motive iiuid comprising diffuser structure, long and short nozzle structures for expanding motive Huid, the

lon nozzle structure projecting into said- 10 digiser structure, and the motive fluid disinches of mercury absolute to a pressure less 15 than eight inches of mercury absolute before reaching the outlet of the long nozzle structure.

ROBERT SUCZEK. 

